PLUG-PORT 4934194 - Caterpillar

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Drain the cooling system to a level below the water temperature regulator housing.
Remove the water temperature regulator from the water temperature regulator housing.Note: Refer to the literature that is supplied by the OEM of the water temperature regulator for the water temperature regulator's opening temperature and opening distance.
Heat water in a pan until the temperature is equal to the opening temperature for the water temperature regulator.
Hang the water temperature regulator in the pan of water. The water temperature regulator must be below the surface of the water and away from the sides and the bottom of the pan.
Keep the water at the correct temperature for ten minutes.
After ten minutes, remove the water temperature regulator. Immediately measure the opening in the water temperature regulator.If the opening agrees with the distance that is specified by the OEM of the water temperature regulator, the water temperature regulator is operating properly.If the distance is less than the distance that is specified by the OEM of the water temperature regulator, obtain a new water temperature regulator.